Wasco, California has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 9.7 °C (low) to 25.2 °C (high). Annual precipitation averages 173.7 Millimeters. Wasco is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.8 °C | 14.1 °C | 35.56 mm |
| February | 4.3 °C | 17.3 °C | 33.02 mm |
| March | 6.4 °C | 20.7 °C | 32 mm |
| April | 8.3 °C | 23.9 °C | 14.22 mm |
| May | 12 °C | 28.5 °C | 5.84 mm |
| June | 15.3 °C | 33 °C | 1.52 mm |
| July | 18.3 °C | 36.1 °C | 0 mm |
| August | 17.4 °C | 35.7 °C | 0 mm |
| September | 14.9 °C | 32.9 °C | 0.76 mm |
| October | 9.9 °C | 27 °C | 7.62 mm |
| November | 4.9 °C | 19.3 °C | 14.73 mm |
| December | 1.8 °C | 14.1 °C | 28.45 mm |
| Annual | 9.7 °C | 25.2 °C | 173.72 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BWk - Cold Desert Climate |